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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732c8d37c4de23f3306801e354491fe85efe7ee7d94dd62c3fcea7f5a7e401f8' 
  AND token = 'f/4gpRWS3SbuxVPIl9nDLnSA17VN+BLVnV/vhajDudo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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