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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed535a69441747cb0272fd63c105a7f18805db94e286fd66cb44d741b647a52' 
  AND token = 'fdNztXt851Eu1isvgL6mWz+H9gDtdBxmgYKsCYZfebc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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