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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd982b19259b2991f623749cfe2b848482c2cf9cfd54fe07bb94f35662767c15a' 
  AND token = 'QN2ijeYOb4/mxfrWBfoD6uRFfPNevqtJnqaYdjeJ2Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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