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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f077dce7025afe40e23538f9caeb1be009f1e3c10cd0f9152e62f4ecda7279b2' 
  AND token = 'ei4zadBQ2Uv3Eh8Eb+QYVuVqQ2qcHnTjZXOC1iPYzww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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