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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b3e3ba4a81b1220f0b1a6906cf40baf2101cde3a60348ec4dd8130f6d68495' 
  AND token = 'kR8uhgbPc/T3OEOMNRXX88ocrewvpGRJBt7Q87BCdbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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