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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec47445e7484e8b70957a5c59cb7d7fdebf4c67b0fd4a86e3170385bd6fa6aa' 
  AND token = 'PdZW6ozBBiPb18wTu6Vc7zn9ceC97mi0gL4cn+ly/l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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