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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deac63c46a60861768bdb13e17511ef4df5ffcd00d12ae4228b01e40dc4cf04a' 
  AND token = 'Y1cZRYmEXiZzg/n0Gs0s/fF8HiPp8sRG3gErFShqcPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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