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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da98da6211fad5f8bdceb2df4bf0b72528e0f6b350f345ad1e0bdf537e46b2a1' 
  AND token = 'cyFCCH0THsE1EBv+uE51A+nSqhVpFFVp/9Zty9cBCOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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