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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2c8f1e6ddc6be6ee44ee933d72def5070cf7bc2ff76c44377a848311b1d933' 
  AND token = 'TEIvP+WE8rhyIVte9G9kl63rKPRFcw5PxzYylYihTNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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