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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c9d28cc1775fc79f397f49e517eaef8ba701b5b617a52de2cef60aa827aa2e' 
  AND token = 'gv75VMxUjYyvnFKR5SDe+WadfDMOTfEoJ/l35vaSMH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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