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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b418bde85706d535669908a1823c3104741f1f216d27846808d2deaa78fc82' 
  AND token = 'QZp2NUW+e0/u6b609ByZFYxfiQ6gdaj16C6wl5jkTV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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