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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41c0cba559f042afe8d922b1b8de0a2267f81aac33c10902f5410b06b9bb9c1' 
  AND token = 'ZP7uR0cjEvpSJ9+VHsz/WYnR3R1Ie5RtZ9nwC7iN6/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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