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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37bf2fe0479ec89fcbb8f8c4a9a0e8ce4cc188cd59a7c30c3cbf159a81ad999' 
  AND token = 'XbEVWxqL/dbiaHKSNMg4fMurKGKqhmJ7khTRLHDPWmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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