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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52da6ba4c27680c3964bdc8047825da746116b23b78ae617bcc2a18dd6ee28e6' 
  AND token = '4/3+vpNYKFPvvctvjuUQKUEC+ClKDuSGJerAfOk2cTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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