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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ec6b2b6cfa8e207e3b74074bcdd32215a690206931c18c325e69d4b5489351' 
  AND token = 'FQI/VkkHfxRKzusB/Ds5h2tAXzQ3gT2oOwgblAVQl7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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