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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1605ca75f360201c2286a370e163b20314cb4454fb08ae6019b92375ef8807' 
  AND token = 'Q0Hpv2hGxN33s2vFLjNhBfaKQ3lOWggVgHoFX0aJJ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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