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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a1e8c82a13bc28cdef85a25241821ccf8f2beada2517be102c1b999a0e67f0' 
  AND token = 'D9qO9cUGvHpzvETMX85hT8mY+Wp0wcaOZmGkBvq42sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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