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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c0b6480cae79f5f26830fbceb046ccd8753cee073f6e904cad9f46fbbdf1f1' 
  AND token = 'lRC3fHYXkAayuXnjh89oF/iBiHWn7G5llTupWC2Q/w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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