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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fe1dc7224d4982c12faaaa610c196a9826ffcbda0f857a8d8e189bcb6994e9' 
  AND token = 'lPs+5WDNNxQ8Oy+ntgF4GsPO89xbuEyh4MtRt99CVTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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