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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d40a84e21d967a546a73604fe17829f5f6e59554552f4f21b329b570c2f07e9' 
  AND token = 'HH2odShA1IpWp3BcMz5pdjv/5wEofnxuGDOBFAXnB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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