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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b0f2d2d3b5ab0ef698ace1d9ad6ed76535c5b31e486f670cb19cabacf650c9' 
  AND token = 'yK2cK7qJ9o8ogzs/ys151yp3tN/5Bi4GVP3tTs0n3I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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