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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5235f33493a4d790c49a5102638f2ed6e93e5d4ef34519c68131eb63923d48cd' 
  AND token = 'pJZP1iLAiheo7MFscEbEv1PZzUOfCvq4AuH5zhWwA78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}