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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f33852f8dc736ec31e0bcf1b88bd07c5e6f9b0c72186af25a301d55eba7d94a' 
  AND token = 'NOPuNz07azbfACZL/RM6kgyfLDVwf57wd52C+qm5Xtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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