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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6410251474046cf50fb341685d75749ed6314e6de45d9717f7d12c5bc42c63' 
  AND token = 'W8no3c+jJ2g6Y65NShdVlbb+yo3aoGMYyrjS/HRY4Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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