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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5ccad1c83970ee4e4a51663b98cb45cefa65e3123c488676bad434edda1113' 
  AND token = 'kLN0bmK49NSx2gaio38rc/8dMOp8vhjJ9UqrydypD6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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