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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61391b68827b77ef677009a40143c306e775c1599f3fc0f267677a6a9d2bfd55' 
  AND token = 'zEc1/yBMU2QUVvtL+wRJgCTVgBB0C0eWMkqlML3W2Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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