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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76596b6912318254667791c16f7284cb23b094b7388a21c3e339d4d1d87bb9c' 
  AND token = '5aFfbai/5TUYqvrAh76LAXt0XOCfMX+aei3G1Xnwtvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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