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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907435e022b1518a7e3bc73e62e23380ed90dd6b5208416d26406d17ea189c2b' 
  AND token = 'MaeJ6n3LBFYg9MSgPQMQG12Vjbus41sLpBmrHmaT1rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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