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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b050aed25f894d56446cc2931e5e402a093049760bc775709dd37ef334f1889c' 
  AND token = 'bY0EczG011A9a9w0dAxgLExxjz1f1ePEFur20FORIXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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