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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283c8659ab18536fac2f35a2eb96926e09b6e3cf803fa690a30c3bfaf9f83e15' 
  AND token = 'WajH38k369quv0eb+dv2s+8pp/tY228ZB060Q1Td7sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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