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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c479925fd9a1d372b5aaa07c3c0e516bf9ca26ff1111a54b65489d12d09a7a88' 
  AND token = 'YEKMI4Us5BFXl83iyDyXZ72oP4h+Fit732dKN6Uos1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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