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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e1c30aa6114d9cb6d5be2b517e36061a2a6862240aa73ff666689650fb717b' 
  AND token = 'JNTS4e7KdzvJioi6N2SbX2NT5lhgBv0ISdY7uEO92J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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