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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e2a38eeed3016b5162ad9616a6ae58708e6f99bc61dceb56c52d2949fe74be' 
  AND token = 'tX23ooedmUqlM4pjHyzopFwsTLfqQzUvjmhAr6iFsvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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