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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d2ebd4e144a73d750b68e8bd95c129e5fbc5adf81c9ead4704b1d708d18470' 
  AND token = 'I4sSgrECosxEDJA0LakOePjakB2mDzcEBz+Lai5W8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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