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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9631c18899fa6dc085f73ce27293025409a9805637d380c2eeb1d856fbea4b1b' 
  AND token = 'yxox81LOAzdfURlxPQpvRd6vGUt2nRNehesEg8z2fb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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