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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29bd8c9fa15a07e233bec408800d16a4be1f077e85034f1ccbcfca5d2d6d8b61' 
  AND token = 'DSScJkgfZx5qxK0mpQqpJLGex6Iyp28uW4+xgc63piU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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