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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41764e24ca25af064d6e6d8373b8524bb9d207ef6a2b3d424e81bd1761cff51' 
  AND token = '7BBe1Wa6w5b+02FKSPH36mWdwV/Y8DYf3Tye+zyogBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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