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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced0e7ebcd04b1c430220f7c4f0855d942b73d6c8f0fb1f4978a1a0378cf97e9' 
  AND token = 'wlDT+9rRMlZimtnI8TZGkbetGIPo3auBl1AMvX1h7Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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