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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6524c2435eb92590e2821cfb2afb1a51df8497644aa01cc6d4f631a53854fe' 
  AND token = 'mF+FyRNTJ9ReqcQEOW7jUzWttX/c58FiRf8dLBfVBFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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