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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abce5a85d8d6459bb8aa1aa022e0b7016f32ca734614d592b16865de0817b4cf' 
  AND token = 'qFuGiTdUQVxVkxcGomJAGgrUO1T96nB2D2UaW5bsb2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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