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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e92e8a2fcf57c791ae0a1028795b26098627679a6cc488a47f60262525c3ae4' 
  AND token = 'Xk5aJpurN2R+k5htrSZDvbStL5MVQ006A/KgTD8+zJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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