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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0d3b6691c42990c978970d392cb72dbef7ee4680501815f1aa95180d83e488' 
  AND token = '4iCJ64n3DriHys8ts7XRgsrtU3bq3s371oFoveZFaro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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