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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0f0ff701a8547875ea2b176b0a0f6e8dd68e839f29ee53357cbec6fa32147e' 
  AND token = 'P6Ve8lh7AGYUPlWLRna3qLVZor9yFv3Lax1C8LuPOtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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