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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989cb87ab384c96f050171980b21547a0aeda7d455ca5eb7c38a96bbcd0ec9a5' 
  AND token = 'Cza9NsN9o7NipRvmomiNSNBAPZLPsXkrm9q5VokMSGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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