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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bc8b6761e75dc2cfb51fb965b2504af6033e5022256e327733420932a7a950' 
  AND token = 'MPSl5JIifapdItFDeE1va4lzltd4X570iLWnaEoM+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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