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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9e421f490c50d9e93a9df028571fb747b42332a89ef5aca74831e2fe0177bf' 
  AND token = '/64Q6Le0jwWO26TnjX2TLTQkpItAKbTGX4FsB+ujIEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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