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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be62f0b10611be1c92f04cb42a9609efad568859e8089798b1bc7fe0a8675de' 
  AND token = 'ErBBEKiMHRbPYp03Y9gyaqFfHEIQHFer8db6noRvq4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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