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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2324402f33c513ba6d24070d26eadc8908c3dedc8cc70b0805fa42fb924e410b' 
  AND token = 'Rm8QtPN2AxrEOtboTt5YDbKonJMKNyB6t2lf6ZHGAQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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