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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fa8ae54a92aee0cbc7fb57cb5f76ed4afe5107ef9ffd3eca2e8ed057c1a5cb' 
  AND token = 'o30WK3mqQH8MFmUqBlCtAFOUrW+JWZnEt930EUz7OKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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