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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ca5299e229f2f9a8b00331ec61a2b5da0669b7b4d3e3829e42299625144b82' 
  AND token = 'DD0/O5wyVJa1cot4dVKetLgFy4K618fsuOO7/rvN/Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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