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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f56e44fbd5d1a7e516a39a8686b285844ecf42b6130fa4f97452835e60f276' 
  AND token = 'fmPsdlc1q7PFEirYfc4nyRwGBwxSM7bwDuHU36pIV/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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