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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f618305712c15a07256ac0e50a2ea7a0979d3d0b4e29ae65f80cf2ed4d63eb5e' 
  AND token = 'X2GFUEhUROaUDP0+lM5BoKXg5dida/HHj4jeYObuduk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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