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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b1d5c7032a469902dd2a9ed310900cc5aa4c49d933ee09cb39f690acc7bcb5' 
  AND token = '2wmniqRisUjRNR5HAxIu6ejsm1xLJJUX2usWiVEz9h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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