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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691094bc048db430e66d7b86d76d67d6db945cfb9d7c8b1a745aca62d0b9c4b3' 
  AND token = 'VFnVx68HwDhqAFQ5gfg6X2kb/98Nqk6Bf0NMPZ3xPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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