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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ed66c705c2e93247e3d1cd417c76c0b02d8d75a6e7c86c37ec48aaeced1e1b' 
  AND token = '7GckXn4sb/thZAs3z3pIzuRVysb3ktju9g/YXqtP0UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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